* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.welcome-container {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.welcome-content {
    text-align: center;
    color: white;
    z-index: 10;
    padding: 2rem;
    max-width: 600px;
    animation: fadeIn 1s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.welcome-header {
    margin-bottom: 2rem;
}

.welcome-header i {
    font-size: 4rem;
    margin-bottom: 1rem;
    color: #ffd700;
}

.welcome-header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.subtitle {
    font-size: 1.5rem;
    opacity: 0.9;
    font-weight: 300;
}

.welcome-message {
    margin-bottom: 2.5rem;
}

.welcome-message h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.welcome-message p {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

.features {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
}

.feature-item i {
    font-size: 2rem;
    color: #ffd700;
}

.feature-item span {
    font-size: 1rem;
    font-weight: 500;
}

.start-button {
    background: linear-gradient(45deg, #ffd700, #ffed4e);
    color: #333;
    border: none;
    padding: 1rem 3rem;
    font-size: 1.2rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.4);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 auto;
}

.start-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 215, 0, 0.6);
}

.start-button:active {
    transform: translateY(-1px);
}

.background-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.floating-shape {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 80px;
    height: 80px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 120px;
    height: 120px;
    top: 60%;
    right: 10%;
    animation-delay: 5s;
}

.shape-3 {
    width: 60px;
    height: 60px;
    bottom: 20%;
    left: 70%;
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    33% {
        transform: translateY(-30px) rotate(120deg);
    }
    66% {
        transform: translateY(30px) rotate(240deg);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .welcome-header h1 {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1.2rem;
    }
    
    .welcome-message h2 {
        font-size: 1.5rem;
    }
    
    .welcome-message p {
        font-size: 1rem;
    }
    
    .features {
        flex-direction: column;
        align-items: center;
    }
    
    .feature-item {
        width: 200px;
    }
    
    .start-button {
        padding: 0.8rem 2.5rem;
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .welcome-content {
        padding: 1rem;
    }
    
    .welcome-header h1 {
        font-size: 2rem;
    }
    
    .welcome-header i {
        font-size: 3rem;
    }
}
